单项选择题

A．can be
B．may be
C．must not be
D．may not be
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单项选择题
A．remainB．leaveC．remainedD．left
A．remain
B．leave
C．remained
D．left
单项选择题
A．better thanB．as well asC．as wellD．as good as
A．better than
B．as well as
C．as well
D．as good as
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